JP5470099B2 - Boiling water nuclear plant and steam dryer - Google Patents

Boiling water nuclear plant and steam dryer Download PDF

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JP5470099B2
JP5470099B2 JP2010048564A JP2010048564A JP5470099B2 JP 5470099 B2 JP5470099 B2 JP 5470099B2 JP 2010048564 A JP2010048564 A JP 2010048564A JP 2010048564 A JP2010048564 A JP 2010048564A JP 5470099 B2 JP5470099 B2 JP 5470099B2
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boiling water
water nuclear
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JP2011185627A (en
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祐子 日野
一成 石田
直志 碓井
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Hitachi GE Nuclear Energy Ltd
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/28—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core
    • G21C19/30—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps
    • G21C19/317—Recombination devices for radiolytic dissociation products
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/28—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core
    • G21C19/30—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/02—Treating gases
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Drying Of Gases (AREA)

Description

本発明は、沸騰水型原子力プラント、および該沸騰水型原子力プラントに設置された蒸気乾燥器に関する。   The present invention relates to a boiling water nuclear plant and a steam dryer installed in the boiling water nuclear plant.

沸騰水型原子力プラントの構成例について説明する。沸騰水型原子力プラントを構成する原子炉圧力容器内には、炉心，気水分離器，蒸気乾燥器が設置されている。炉心の上部に設置された気水分離器は、炉心で発生した蒸気を冷却水から分離し、気水分離器の上部に設置された蒸気乾燥器は、気水分離器で分離された蒸気から液滴を除去する。蒸気乾燥器で液滴量が一定値以下になるよう乾燥された蒸気は、主蒸気ノズルから主蒸気ラインを通じて蒸気タービンに供給される。   A configuration example of the boiling water nuclear power plant will be described. A reactor core, a steam separator, and a steam dryer are installed in the reactor pressure vessel constituting the boiling water nuclear power plant. The steam separator installed at the top of the core separates the steam generated in the core from the cooling water, and the steam dryer installed at the top of the steam separator separates from the steam separated by the steam separator. Remove the droplets. The steam dried by the steam dryer so that the droplet amount becomes a certain value or less is supplied from the main steam nozzle to the steam turbine through the main steam line.

上記のように構成された沸騰水型原子力プラントでは、炉心において、炉水の酸素（Ｏ−１６）と中性子との反応により放射性窒素（Ｎ−１６）が生成する。このＮ−１６は、半減期が７.１秒で、高エネルギーガンマ線（６.１２９ＭｅＶ）を放出する。生成したＮ−１６のうち、揮発性が高いアンモニア（ＮＨ3）や一酸化窒素（ＮＯ）の化学形態をとるものは、炉水中に滞留せず、揮発して蒸気とともに蒸気タービンに到達するため、タービン系における線量増加の要因となっている。 In the boiling water nuclear power plant configured as described above, radioactive nitrogen (N-16) is generated in the reactor core by a reaction between oxygen (O-16) in the reactor water and neutrons. This N-16 has a half-life of 7.1 seconds and emits high energy gamma rays (6.129 MeV). Among the produced N-16, those that take the chemical form of ammonia (NH 3 ) or nitric oxide (NO) with high volatility do not stay in the reactor water but volatilize and reach the steam turbine together with the steam. This is a cause of increased dose in turbine systems.

近年、沸騰水型原子力プラントでは、原子炉圧力容器内の炉水中の溶存酸素を低減させて原子炉圧力容器やその内部構造物の構造材料の応力腐食割れを防止するために、水素注入が行われている。しかし、水素注入量が増加すると、ある水素注入量の値を境に急激にタービン系の放射線線量率が上昇する傾向がある。これは、通常運転中は硝酸イオン等の揮発性の低い化学形態で炉水中に溶解しているＮ−１６が、水素注入により還元されて揮発性が高いＮＨ3やＮＯの化学形態となり、主蒸気に同伴されるためである。放射線線量率の上昇のため、注入できる水素量には上限が設定される。 In recent years, in boiling water nuclear power plants, hydrogen injection has been performed to reduce the dissolved oxygen in the reactor water in the reactor pressure vessel and prevent stress corrosion cracking of the structural material of the reactor pressure vessel and its internal structure. It has been broken. However, when the amount of hydrogen injection increases, the radiation dose rate of the turbine system tends to increase abruptly at a certain hydrogen injection amount. This is because N-16, which is dissolved in the reactor water in a low-volatile chemical form such as nitrate ions during normal operation, is reduced by hydrogen injection into a highly volatile NH 3 or NO chemical form. This is because it is accompanied by steam. Due to the increase in radiation dose rate, an upper limit is set for the amount of hydrogen that can be injected.

従来、タービン系に移行するＮ−１６量を低減する技術として、気水分離器と蒸気乾燥器の間に触媒を設置し、揮発性の高いアンモニア形態のＮ−１６を揮発性の低い窒素酸化物にする方法が提案されている（例えば、特許文献１）。   Conventionally, as a technique for reducing the amount of N-16 transferred to the turbine system, a catalyst is installed between the steam separator and the steam dryer, and N-16 in the form of ammonia having high volatility is oxidized with nitrogen having low volatility. A method for making a product has been proposed (for example, Patent Document 1).

さらに、Ｎ−１６は半減期が短いため、蒸気乾燥器から主蒸気ノズルまで蒸気が到達する時間を物理的に遅延させ、減衰させることでタービン系への移行量を低減させる技術（例えば、特許文献２）が提案されている。   Furthermore, since N-16 has a short half-life, the time required for steam to reach the main steam nozzle from the steam dryer is physically delayed and attenuated to reduce the amount of transition to the turbine system (for example, patents). Document 2) has been proposed.

特開平７−１５１８９８号公報JP 7-151898 A 特開２００１−１４７２９１号公報JP 2001-147291 A

しかしながら、特許文献１では、気水分離器と蒸気乾燥器の間に触媒が設置されているため、水分を多く含む蒸気が触媒表面に付着し、触媒の表面に水の膜が形成される可能性がある。このため、気相中のＮ−１６が接触する触媒表面の面積が小さくなり、効率に困難な点があった。   However, in Patent Document 1, since the catalyst is installed between the steam separator and the steam dryer, steam containing a lot of moisture can adhere to the catalyst surface, and a water film can be formed on the surface of the catalyst. There is sex. For this reason, the area of the catalyst surface which N-16 in a gaseous phase contacts becomes small, and there existed a point with difficult efficiency.

特許文献２に開示された技術により、主蒸気配管内において吸着によりＮ−１６を低減させるためには、Ｎ−１６と吸着物とが十分に接触するための面積が必要となる。しかし、そのためには蒸気流路である主蒸気配管を狭くするか、細管を複数設置する必要があり、発電効率低下につながる恐れがあった。また、特許文献２には気水分離器，蒸気乾燥器に貴金属をメッキする方法について記載されているが、仮に現行の沸騰水型原子力プラントに設置された蒸気乾燥器の構成部材である波板に貴金属をメッキした場合、乾燥蒸気は波板に接触する確率が低いため、乾燥蒸気中に含まれるＮ−１６が波板にメッキされた貴金属に吸着する確率も低くなり、移行量低減の効率の点で課題があった。また、引用文献２において、蒸気乾燥器の構成部材である整流板に貴金属をメッキする場合も、現行の蒸気乾燥器の整流板は厚さ数mmの金属板に複数の孔を開けた構造であり、整流板と接触せず通過する蒸気もあるため、Ｎ−１６の貴金属への吸着効率と移行量の低減効果に課題があった。   In order to reduce N-16 by adsorption in the main steam pipe by the technique disclosed in Patent Document 2, an area for sufficient contact between N-16 and the adsorbate is required. However, for that purpose, it is necessary to narrow the main steam pipe, which is the steam flow path, or to install a plurality of thin tubes, which may lead to a decrease in power generation efficiency. Patent Document 2 describes a method for plating a noble metal on a steam separator and a steam dryer. However, a corrugated sheet is a component of a steam dryer installed in a current boiling water nuclear power plant. When the noble metal is plated on the plate, the probability that the dry steam is in contact with the corrugated plate is low, so the probability that N-16 contained in the dry vapor is adsorbed on the noble metal plated on the corrugated plate is also low, and the amount of migration is reduced. There was a problem in terms of. Also, in Cited Document 2, even when precious metal is plated on the current plate that is a component of the steam dryer, the current current plate of the steam dryer has a structure in which a plurality of holes are formed in a metal plate having a thickness of several millimeters. In addition, some steam passes without contacting the current plate, so there is a problem in the adsorption efficiency of N-16 to the noble metal and the effect of reducing the transfer amount.

本発明は上記のような状況を鑑みてなされたもので、沸騰水型原子力プラントにおいて、Ｎ−１６のタービン系への移行量を低減することでタービン系の線量率を低減する沸騰水型原子力プラントを提供することを目的とする。   The present invention has been made in view of the above situation, and in a boiling water nuclear power plant, boiling water nuclear power that reduces the dose rate of the turbine system by reducing the amount of N-16 transferred to the turbine system. The purpose is to provide a plant.

本発明に係る沸騰水型原子力プラントは、上述した課題を解決するために、原子力プラントの原子炉圧力容器内に設置される蒸気乾燥器内の蒸気が通過する領域に、Ｎ−１６を含む窒素化合物を捕捉する能力を有する材料を担持した多孔体を設置する。   In order to solve the above-described problems, a boiling water nuclear power plant according to the present invention includes nitrogen containing N-16 in a region through which steam in a steam dryer installed in a reactor pressure vessel of a nuclear power plant passes. A porous body carrying a material capable of capturing a compound is installed.

本発明に係る沸騰水型原子力プラントおよび蒸気乾燥器によれば、発電効率を維持しつつ、Ｎ−１６を含む窒素化合物を捕捉する能力を有する材料とＮ−１６を含む窒素化合物との接触効率が向上し、Ｎ−１６のタービン系への移行量を低減することができ、タービン系の線量率を低減することができる。   According to the boiling water nuclear power plant and the steam dryer according to the present invention, the contact efficiency between the material having the ability to capture the nitrogen compound containing N-16 and the nitrogen compound containing N-16 while maintaining the power generation efficiency. And the amount of N-16 transferred to the turbine system can be reduced, and the dose rate of the turbine system can be reduced.

本発明の一実施形態である沸騰水型原子力プラントの構成を示す縦断面図である。It is a longitudinal section showing the composition of the boiling water nuclear power plant which is one embodiment of the present invention. 第１の実施例の沸騰水型原子力プラントに設置される蒸気乾燥器の構成を示す斜視図である。It is a perspective view which shows the structure of the steam dryer installed in the boiling water nuclear power plant of a 1st Example. 第１の実施例の沸騰水型原子力プラントに設置される蒸気乾燥器の構成を示す断面図（図２のＡ−Ａ断面図）である。It is sectional drawing (AA sectional drawing of FIG. 2) which shows the structure of the steam dryer installed in the boiling water nuclear power plant of a 1st Example. 第１の実施例の沸騰水型原子力プラントに設置される蒸気乾燥器の縦断面図である。It is a longitudinal cross-sectional view of the steam dryer installed in the boiling water nuclear power plant of a 1st Example. ゼオライトによるアンモニア吸着試験の結果を示す図である。It is a figure which shows the result of the ammonia adsorption test by a zeolite. 本発明の第２の実施例である沸騰水型原子力プラントに設置される蒸気乾燥器の縦断面図である。It is a longitudinal cross-sectional view of the steam dryer installed in the boiling water nuclear power plant which is the 2nd Example of this invention. 本発明の第３の実施例である沸騰水型原子力プラントに設置される蒸気乾燥器の縦断面図である。It is a longitudinal cross-sectional view of the steam dryer installed in the boiling water nuclear power plant which is the 3rd Example of this invention.

以下、本発明の実施の形態を、図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施例１）
本発明に係る沸騰水型原子力プラントの構成を、図１，図２，図３，図４を用いて説明する。図１は沸騰水型原子力プラントの縦断面図、図２は沸騰水型原子力プラントの原子炉圧力容器内に設置された蒸気乾燥器の斜視図、図３は図２の蒸気乾燥器のＡ−Ａ断面図、図４は蒸気乾燥器の縦断面図を示す。 Example 1
A configuration of a boiling water nuclear power plant according to the present invention will be described with reference to FIGS. 1, 2, 3, and 4. 1 is a longitudinal sectional view of a boiling water nuclear plant, FIG. 2 is a perspective view of a steam dryer installed in a reactor pressure vessel of the boiling water nuclear plant, and FIG. 3 is an A- of the steam dryer of FIG. A sectional drawing and FIG. 4 show the longitudinal cross-sectional view of a steam dryer.

沸騰水型原子力プラントを構成する原子炉圧力容器１内には、図１に示すように、炉心２，気水分離器３，蒸気乾燥器４が設置されている。炉心２内では、炉心２内に設置された原子燃料より放出される熱により炉心２内を循環する冷却水が加熱され、蒸気が発生する。また、原子燃料より放出される中性子は、冷却水中の酸素原子（Ｏ−１６）と核反応を起こし、これにより放射性窒素（Ｎ−１６）が生成する。核反応により生成したＮ−１６は、冷却水中の水分子や、水分子が放射線分解して生成したラジカル等と反応し、アンモニアや窒素酸化物（ＮＯ，ＮＯ2，ＮＯ3 -など）の化学形態をとる。これらのＮ−１６を含む窒素化合物のうち、揮発性の高いアンモニアやＮＯの形態をとるものは、気体として蒸気とともに炉心２内を移動する。 As shown in FIG. 1, a reactor core 2, a steam-water separator 3, and a steam dryer 4 are installed in a reactor pressure vessel 1 that constitutes a boiling water nuclear power plant. In the core 2, the cooling water circulating in the core 2 is heated by the heat released from the nuclear fuel installed in the core 2 to generate steam. Moreover, the neutron emitted from the nuclear fuel causes a nuclear reaction with oxygen atoms (O-16) in the cooling water, thereby generating radioactive nitrogen (N-16). N-16 produced by a nuclear reaction, the water molecules and the cooling water, reacts with radicals water molecules generated by radiolysis, etc., ammonia, nitrogen oxides (NO, NO 2, NO 3 - etc.) Chemistry Takes form. Among these nitrogen compounds containing N-16, those in the form of highly volatile ammonia or NO move in the core 2 together with steam as a gas.

炉心２で発生した蒸気は、冷却水とともに原子炉圧力容器１内を上方へ移動し、炉心２の上部に設置された気水分離器３に達する。気水分離器３では、炉心２で発生した蒸気を冷却水から分離する。この際、蒸気中に気体として含まれるＮ−１６を含む窒素化合物は、気水分離器３を蒸気とともに通過し、蒸気乾燥器４に達する。蒸気乾燥器４では、気水分離器３で分離された蒸気から、当該蒸気に含まれる液滴量が一定値以下になるよう、液滴を除去し蒸気を乾燥する。ここでも、気体状のＮ−１６を含む窒素化合物は、乾燥された蒸気とともに蒸気乾燥器４を通過する。蒸気乾燥器４で乾燥されたＮ−１６窒素化合物を含む蒸気は、主蒸気ノズル５から主蒸気ラインを通じて蒸気タービンに供給されるため、Ｎ−１６から放出される高エネルギーガンマ線により、タービン系の放射線線量率が増加している。   The steam generated in the reactor core 2 moves upward in the reactor pressure vessel 1 together with the cooling water, and reaches the steam / water separator 3 installed in the upper part of the reactor core 2. In the steam / water separator 3, the steam generated in the core 2 is separated from the cooling water. At this time, the nitrogen compound containing N-16 contained as a gas in the steam passes through the steam separator 3 together with the steam and reaches the steam dryer 4. In the steam dryer 4, the droplets are removed from the steam separated by the steam separator 3 so that the amount of droplets contained in the steam becomes a predetermined value or less, and the steam is dried. Again, the nitrogen compound containing gaseous N-16 passes through the steam dryer 4 with the dried steam. Since the steam containing N-16 nitrogen compound dried by the steam dryer 4 is supplied from the main steam nozzle 5 to the steam turbine through the main steam line, the high energy gamma rays emitted from the N-16 cause the turbine system to The radiation dose rate is increasing.

次に、蒸気乾燥器４の構成と蒸気乾燥器４内での蒸気の流れについて、図２，図３，図４を用いて説明する。蒸気乾燥器ユニット１１は、図２に示すように、フードプレート６（以下、フード６），整流板７および１０、固定棒９（図３）及び波板８を備える。蒸気の流れの上流側（入口側）に整流板７を設置し、下流側（出口側）に整流板７を設置する。波板８は、整流板７と整流板１０の間に配置され、固定棒９で固定される。フード６は、蒸気乾燥器ユニット１１の整流板７を覆うように設置され、下方に開口部を有する。図２では、フード６の一部の構成のみを示す。蒸気乾燥器４は、複数の蒸気乾燥器ユニット１１を設置して構成されている。   Next, the configuration of the steam dryer 4 and the flow of steam in the steam dryer 4 will be described with reference to FIGS. As shown in FIG. 2, the steam dryer unit 11 includes a hood plate 6 (hereinafter, hood 6), rectifying plates 7 and 10, a fixing rod 9 (FIG. 3), and a corrugated plate 8. The current plate 7 is installed on the upstream side (inlet side) of the steam flow, and the current plate 7 is installed on the downstream side (outlet side). The corrugated plate 8 is disposed between the rectifying plate 7 and the rectifying plate 10 and is fixed by the fixing rod 9. The hood 6 is installed so as to cover the current plate 7 of the steam dryer unit 11 and has an opening below. In FIG. 2, only a part of the configuration of the hood 6 is shown. The steam dryer 4 is configured by installing a plurality of steam dryer units 11.

気水分離器３を通過した液滴を含む蒸気は、フード６の下方に形成された開口部より流入し、蒸気乾燥器ユニット１１を通過して原子炉圧力容器１の上部へ開放される。図４に蒸気の流れを破線矢印で示す。蒸気はフード６で上向きから水平方向に流れの向きが変えられ、整流板７で分散され、波板８の間を通過して後段の整流板１０を通り、原子炉圧力容器１の上部に放出される。   Steam containing droplets that have passed through the steam separator 3 flows from an opening formed below the hood 6, passes through the steam dryer unit 11, and is released to the top of the reactor pressure vessel 1. In FIG. 4, the flow of steam is indicated by broken-line arrows. The flow of steam is changed from upward to horizontal in the hood 6, dispersed in the rectifying plate 7, passes between the corrugated plates 8, passes through the subsequent rectifying plate 10, and is discharged to the upper portion of the reactor pressure vessel 1. Is done.

本実施例の特徴の一つは、蒸気乾燥器４に設置される整流板７及び整流板１０の両方、もしくは一方を、Ｎ−１６を含む窒素化合物を捕捉する性能を有する材料（以下、Ｎ−１６捕捉材料と記す）を担持した多孔体より構成される点にある。このような構成により、整流板７および１０を通過する蒸気に含まれるＮ−１６は、整流板７および１０を通過する際に、Ｎ−１６捕捉材料と接触して捕捉され、蒸気から分離される。その結果、蒸気とともにタービン系に移行するＮ−１６の量が低減し、タービン系の放射線線量率を低減することができる。先にも述べたように、Ｎ−１６は半減期が７.１秒と短く、吸着材上に７秒保持できると減衰してＮ−１６量が１／２になるので、Ｎ−１６に起因するタービン系の線量も１／２に低減できる。   One of the features of the present embodiment is that a material (hereinafter referred to as N) that captures a nitrogen compound containing N-16 is used for both or one of the current plate 7 and the current plate 10 installed in the steam dryer 4. -16 capture material)). With such a configuration, N-16 contained in the steam passing through the rectifying plates 7 and 10 is captured in contact with the N-16 trapping material and separated from the steam when passing through the rectifying plates 7 and 10. The As a result, the amount of N-16 that moves to the turbine system together with the steam is reduced, and the radiation dose rate of the turbine system can be reduced. As mentioned earlier, N-16 has a short half-life of 7.1 seconds, and if it can be held on the adsorbent for 7 seconds, it will decay and the N-16 amount will be halved. The resulting turbine system dose can also be reduced by half.

ここで、Ｎ−１６捕捉材料を設置する場所が整流板７および１０である理由を説明する。Ｎ−１６捕捉材料を設置する場所を選定する際には、Ｎ−１６の捕捉効率がよいこと、および発電効率に影響を与えないことが重要な因子となる。Ｎ−１６の捕捉効率は、蒸気との接触効率がよく、蒸気との接触時間がＮ−１６を捕捉するのに十分な時間になることで向上することができる。   Here, the reason why the place where the N-16 capturing material is installed is the rectifying plates 7 and 10 will be described. When selecting a place where the N-16 capture material is to be installed, it is an important factor that the capture efficiency of N-16 is good and that power generation efficiency is not affected. The trapping efficiency of N-16 can be improved when the contact efficiency with the vapor is good and the contact time with the steam becomes a sufficient time for trapping N-16.

ここで、Ｎ−１６の捕捉効率と蒸気との接触時間との関係について、発明者らが実施した実験の結果を基に説明する。発明者らは、Ｎ−１６の代表的化学形態であるアンモニアと、アンモニア吸着材の一例としてゼオライトを用い、アンモニアがゼオライトに吸着保持される時間のガス線速依存性を実験により調べた。試験では、ゼオライトを充填した吸着塔を、蒸気乾燥器４を通過する蒸気温度を模擬して２８５度前後に加熱して飽和蒸気（大気圧）を流通し、吸着塔入口よりアンモニアをパルス状に１回注入して出口蒸気のアンモニア濃度を測定した。試験では、吸着塔に流通する飽和蒸気の線速度をパラメータとした。図５に出口蒸気のアンモニア濃度を時間に対してプロットした図を示すが、これより、蒸気線速度が小さいほどアンモニアの流出が遅く、また流出ピークの幅（出口蒸気からアンモニアが検出される時間）が長くなる傾向がある。このことは、蒸気線速度が小さい、すなわち吸着材であるゼオライトとの接触時間が長くなるほど、アンモニアが吸着材上に留まる時間が長くなることを示している。よって、蒸気線速度が小さい領域にＮ−１６捕捉材料を設置することで、Ｎ−１６の捕捉効率が向上できる。   Here, the relationship between the trapping efficiency of N-16 and the contact time with steam will be described based on the results of experiments conducted by the inventors. The inventors used ammonia, which is a typical chemical form of N-16, and zeolite as an example of an ammonia adsorbent, and examined the dependence of the time during which ammonia was adsorbed on the zeolite on the gas linear velocity by experiments. In the test, the adsorption tower filled with zeolite is heated to around 285 degrees by simulating the vapor temperature passing through the vapor dryer 4, and saturated vapor (atmospheric pressure) is circulated, and ammonia is pulsed from the adsorption tower inlet. Once injected, the ammonia concentration in the outlet steam was measured. In the test, the linear velocity of saturated steam flowing through the adsorption tower was used as a parameter. FIG. 5 shows a plot of the ammonia concentration of the outlet steam versus time. From this, the smaller the vapor linear velocity, the slower the ammonia outflow, and the width of the outflow peak (the time during which ammonia is detected from the outlet steam). ) Tends to be longer. This indicates that the time during which ammonia stays on the adsorbent increases as the vapor linear velocity decreases, that is, as the contact time with the zeolite as the adsorbent increases. Therefore, the trapping efficiency of N-16 can be improved by installing the N-16 trapping material in a region where the vapor linear velocity is low.

蒸気の通過割合が大きく、さらに蒸気流路の狭いほど蒸気との接触効率が大きくなる。
このことを鑑みると、蒸気乾燥器４内の整流板７および１０は、原子炉圧力容器１の上部に放出されて主蒸気ラインへ進む蒸気の全量が通過すること、整流板７および１０における蒸気の線速度は１ｍ／秒以下と小さいこと、蒸気を整流する目的から蒸気流路が狭い構造になっていることから、Ｎ−１６捕捉材料を設置するのに好適であり、高いＮ−１６捕捉効率を得ることができる。 As the steam passage ratio is larger and the steam flow path is narrower, the contact efficiency with the steam increases.
In view of this, the rectifying plates 7 and 10 in the steam dryer 4 pass through the entire amount of steam discharged to the upper part of the reactor pressure vessel 1 and proceeding to the main steam line, and the steam in the rectifying plates 7 and 10. Since the linear velocity of 1m / sec or less is small and the steam flow path has a narrow structure for the purpose of rectifying steam, it is suitable for installing N-16 capture material, and high N-16 capture Efficiency can be obtained.

本実施例のように整流板７及び整流板１０の両方、もしくはいずれか一方に、Ｎ−１６を含む窒素化合物を捕捉する機能を持たせることで、蒸気の通過割合が大きくなり、蒸気との接触効率が大きくなってＮ−１６の捕捉効率が向上する。さらに、整流板７及び整流板１０を多孔体で構成することによって、蒸気流路を狭くでき、蒸気との接触効率が大きくなって、Ｎ−１６の捕捉効率をさらに向上することができる。   As in this embodiment, by providing a function of capturing the nitrogen compound containing N-16 in either or both of the rectifying plate 7 and the rectifying plate 10, the steam passage ratio increases, The contact efficiency is increased, and the capture efficiency of N-16 is improved. Further, by configuring the rectifying plate 7 and the rectifying plate 10 with a porous body, the steam flow path can be narrowed, the contact efficiency with steam is increased, and the trapping efficiency of N-16 can be further improved.

発電効率の点では、従来の蒸気乾燥器４においても多孔板で構成されていることから、従来の蒸気乾燥器の整流板で使用される多孔板と同程度かそれ以下の圧力損失をもつ多孔体で整流板７および１０を構成することで、発電効率を維持しつつＮ−１６の低減が可能である。   In terms of power generation efficiency, the conventional steam dryer 4 is also composed of a porous plate, so that the porous plate has a pressure loss equivalent to or lower than the porous plate used in the current plate of the conventional steam dryer. By configuring the rectifying plates 7 and 10 with a body, N-16 can be reduced while maintaining power generation efficiency.

Ｎ−１６捕捉材料としては、アンモニアや一酸化窒素といった、蒸気に同伴するＮ−１６の化合物を吸着したり、反応により化学結合を形成したり、触媒反応で分解したりすることができる材料のうち１つ以上の材料より選定される。例えば、アンモニアに対して吸着能力をもつ化合物である、固体表面上に酸点をもつ金属酸化物やゼオライト，セピオライトなどの粘土鉱物、ヒドロキシルアパタイト，活性炭などの炭素系化合物や金属炭化物などが選定される。また、白金，ニッケル，ルテニウム，マンガンなどの金属を担持したアンモニア分解触媒も使用できる。一酸化窒素に代表される窒素酸化物に対して吸着能力を持つ金属および金属酸化物や、白金，遷移金属などを担持した窒素酸化物分解触媒も使用できる。   The N-16 trapping material is a material that can adsorb N-16 compounds accompanying the vapor, such as ammonia or nitric oxide, form a chemical bond by reaction, or decompose by catalytic reaction. Of these, one or more materials are selected. For example, metal oxides with acid adsorption on solid surfaces, clay minerals such as zeolite and sepiolite, carbon-based compounds such as hydroxylapatite and activated carbon, and metal carbides, which are compounds capable of adsorbing ammonia, are selected. The An ammonia decomposition catalyst carrying a metal such as platinum, nickel, ruthenium, or manganese can also be used. Nitrogen oxide decomposition catalysts carrying metals and metal oxides capable of adsorbing nitrogen oxides typified by nitrogen monoxide, platinum, and transition metals can also be used.

Ｎ−１６捕捉材料は、ステンレス鋼などの金属鋼材で製造された多孔体に担持される。
多孔体の形状は、板状の鋼材に細孔を開けたもの、ハニカム，メタルリボン，網状，発泡金属，スポンジ状などが例として挙げられる。 The N-16 trapping material is supported on a porous body made of a metal steel material such as stainless steel.
Examples of the shape of the porous body include a plate-shaped steel material having pores, a honeycomb, a metal ribbon, a net, a foam metal, a sponge, and the like.

Ｎ−１６捕捉材料を金属鋼材に担持する方法は、バインダを使用する方法、反応により添着する方法などが例として挙げられるが、選定されるＮ−１６捕捉材料と金属鋼材の種類により、最適な方法を選定する。   Examples of the method of supporting the N-16 trapping material on the metal steel material include a method using a binder and a method of attaching by reaction, but the optimum method depends on the type of the selected N-16 trapping material and metal steel material. Select a method.

また、蒸気乾燥器４の構造的な強度などの設計要件を満足できる場合には、Ｎ−１６捕捉材料自体を多孔体に加工して、整流板７および１０として使用することもできる。   Further, when the design requirements such as the structural strength of the steam dryer 4 can be satisfied, the N-16 trapping material itself can be processed into a porous body and used as the rectifying plates 7 and 10.

整流板７および１０で使用されるＮ−１６捕捉材料および多孔体の構造材料は、どちらも同じ材料でもよいし、それぞれ異なる材料でもよい。整流板７と整流板１０を通過する蒸気は、含まれる液滴量が異なり、整流板７を通過する蒸気は整流板１０を通過する蒸気より液滴量が多い。そのため、整流板７で使用するＮ−１６捕捉材料は水を含む条件で捕捉効率の高いものを選定し、整流板１０で使用するＮ−１６捕捉材料は乾燥条件で捕捉効率の高いものを選定してもよい。   Both the N-16 trapping material and the porous structural material used in the current plates 7 and 10 may be the same material or different materials. The steam passing through the rectifying plate 7 and the rectifying plate 10 has different droplet amounts, and the steam passing through the rectifying plate 7 has a larger amount of droplets than the steam passing through the rectifying plate 10. Therefore, the N-16 trapping material used in the rectifying plate 7 is selected with a high trapping efficiency under conditions including water, and the N-16 trapping material used in the rectifying plate 10 is selected with a high trapping efficiency under dry conditions. May be.

本実施例の沸騰水型原子力プラントおよび蒸気乾燥器によれば、沸騰水型原子力プラントにおいて生成するＮ−１６を含む窒素化合物を、当該原子力プラントの原子炉圧力容器内に設置された蒸気乾燥器において捕捉することで、発電効率を維持しつつ、Ｎ−１６を含む窒素化合物を捕捉する能力を有する材料とＮ−１６を含む窒素化合物との接触効率が向上し、Ｎ−１６のタービン系への移行量を低減することができ、タービン系の線量率を低減することができる。   According to the boiling water nuclear plant and the steam dryer of the present embodiment, the steam dryer in which the nitrogen compound containing N-16 generated in the boiling water nuclear plant is installed in the reactor pressure vessel of the nuclear plant. By capturing at, the contact efficiency between the material having the ability to capture nitrogen compounds containing N-16 and the nitrogen compounds containing N-16 is improved while maintaining the power generation efficiency, and the N-16 turbine system is improved. Can be reduced, and the dose rate of the turbine system can be reduced.

（実施例２）
本発明の第２の実施例を、図面を用いて説明する。原子炉圧力容器１内での蒸気の流れは実施例１と同等であり、記述を省略する。 (Example 2)
A second embodiment of the present invention will be described with reference to the drawings. The flow of steam in the reactor pressure vessel 1 is the same as that in the first embodiment, and the description is omitted.

本実施例の蒸気乾燥器４２は、図６に示すように、フード６，整流板７２および１０２、固定棒９，固定棒９で固定される波板８を備え、さらに、Ｎ−１６捕捉装置１２および１３を備える。本実施例の特徴の一つは、Ｎ−１６捕捉装置１２を蒸気の入口側の整流板７２の手前に配置し、Ｎ−１６捕捉装置１３を蒸気の出口側整流板１０２の後段に設置する点にある。Ｎ−１６捕捉装置１２および１３は、Ｎ−１６捕捉材料を担持した多孔体よりなる。   As shown in FIG. 6, the steam dryer 42 of this embodiment includes a hood 6, rectifying plates 72 and 102, a fixing rod 9, and a corrugated plate 8 fixed by the fixing rod 9, and further includes an N-16 capturing device. 12 and 13 are provided. One of the features of the present embodiment is that the N-16 trapping device 12 is disposed in front of the steam inlet side rectifying plate 72, and the N-16 trapping device 13 is disposed at the rear stage of the steam outlet side rectifying plate 102. In the point. The N-16 capturing devices 12 and 13 are made of a porous body carrying an N-16 capturing material.

気水分離器３を通過した蒸気は、フード６からＮ−１６捕捉装置１２を通って整流板７２，波板８，整流板１０２を通過し、Ｎ−１６捕捉装置１３を通って原子炉圧力容器１の上方に放出される。蒸気がＮ−１６捕捉装置１２および１３を通過する際、蒸気中に含まれるＮ−１６が吸着，反応，触媒作用等により捕捉され、タービン系に移行するＮ−１６量が低減される。   The steam that has passed through the steam separator 3 passes through the N-16 trapping device 12 from the hood 6, passes through the rectifying plate 72, the corrugated plate 8, and the rectifying plate 102, and passes through the N-16 trapping device 13 to the reactor pressure. It is discharged above the container 1. When steam passes through the N-16 traps 12 and 13, N-16 contained in the steam is trapped by adsorption, reaction, catalysis, etc., and the amount of N-16 transferred to the turbine system is reduced.

本実施例では、蒸気乾燥器４の空間部分にＮ−１６捕捉装置１２および１３を設置するため、このＮ−１６捕捉装置１２および１３を設置可能な範囲で厚みを大きくすることができる。Ｎ−１６捕捉装置１２および１３の厚さが厚い方が、蒸気がＮ−１６捕捉材料に接触する時間が長くなり、捕捉されるＮ−１６量が増加するため、タービン系の線量低減効果が大きくなる。   In this embodiment, since the N-16 capturing devices 12 and 13 are installed in the space portion of the steam dryer 4, the thickness can be increased within a range in which the N-16 capturing devices 12 and 13 can be installed. The thicker the N-16 capture devices 12 and 13, the longer the time for the vapor to contact the N-16 capture material and the greater the amount of N-16 that is captured, resulting in a turbine system dose reduction effect. growing.

Ｎ−１６捕捉装置１２および１３の厚さは、設置場所の大きさとともに、発電効率を維持できる圧力損失以下となるように規定される。   The thickness of the N-16 capturing devices 12 and 13 is defined so as to be equal to or less than the pressure loss that can maintain the power generation efficiency, along with the size of the installation location.

Ｎ−１６捕捉装置１２および１３は、実施例１と同様、蒸気に同伴するＮ−１６の化合物を吸着，反応，触媒分解などができる材料のうち１つ以上の材料より選定されたＮ−１６捕捉材料を、金属鋼材などで製造された多孔体に担持して製造する。構造的強度が確保できる場合は、Ｎ−１６捕捉材料で多孔体を形成し、Ｎ−１６捕捉装置とすることもできる。   As in Example 1, the N-16 traps 12 and 13 are selected from one or more materials selected from one or more materials that can adsorb, react, and decompose the N-16 compound accompanying the vapor. The capture material is manufactured by being supported on a porous body made of a metal steel material or the like. When the structural strength can be ensured, a porous body can be formed from the N-16 trapping material to form an N-16 trapping device.

Ｎ−１６捕捉装置１２および１３は、その両方を設置してもよいし、いずれか一方のみを設置してもよい。また、Ｎ−１６捕捉装置１２および１３で使用するＮ−１６捕捉材料および多孔体の構造材料は、同じでもよいし異なる材料でもよい。   Both of the N-16 capturing devices 12 and 13 may be installed, or only one of them may be installed. Further, the N-16 trapping material and the porous structural material used in the N-16 trapping devices 12 and 13 may be the same or different.

本実施例の沸騰水型原子力プラントおよび蒸気乾燥器によれば、沸騰水型原子力プラントにおいて生成するＮ−１６を含む窒素化合物を、当該原子力プラントの原子炉圧力容器内に設置された蒸気乾燥器において捕捉することで、発電効率を維持しつつ、Ｎ−１６を含む窒素化合物を捕捉する能力を有する材料とＮ−１６を含む窒素化合物との接触効率が向上し、Ｎ−１６のタービン系への移行量を低減することができ、タービン系の線量率を低減することができる。   According to the boiling water nuclear plant and the steam dryer of the present embodiment, the steam dryer in which the nitrogen compound containing N-16 generated in the boiling water nuclear plant is installed in the reactor pressure vessel of the nuclear plant. By capturing at, the contact efficiency between the material having the ability to capture nitrogen compounds containing N-16 and the nitrogen compounds containing N-16 is improved while maintaining the power generation efficiency, and the N-16 turbine system is improved. Can be reduced, and the dose rate of the turbine system can be reduced.

また、本実施例によれば、従来の蒸気乾燥器の空間部分にＮ−１６捕捉装置を設置するため、蒸気乾燥器を交換する必要がなく経済性が高い。また、蒸気乾燥器の空間部分に設置できる範囲でＮ−１６捕捉装置の厚みを増やすことができ、Ｎ−１６の移行およびタービン系の線量の低減効果を大きくすることができる。   Moreover, according to the present Example, since N-16 capture | acquisition apparatus is installed in the space part of the conventional steam dryer, it is not necessary to replace | exchange a steam dryer and it is economical. Further, the thickness of the N-16 capturing device can be increased within a range that can be installed in the space portion of the steam dryer, and the effect of reducing the N-16 migration and turbine system dose can be increased.

（実施例３）
本発明の第３の実施例を、図面を用いて説明する。なお、原子炉圧力容器１内での蒸気の流れは実施例１と同等であり、記述を省略する。 (Example 3)
A third embodiment of the present invention will be described with reference to the drawings. Note that the steam flow in the reactor pressure vessel 1 is the same as that in the first embodiment, and a description thereof will be omitted.

第３の実施例の蒸気乾燥器４３は、図７に示すように、フード６，整流板７３および１０３、固定棒９および固定棒９で固定された波板８を備え、さらに、Ｎ−１６捕捉装置２２および２３を備える。本実施例の特徴の一つは、Ｎ−１６捕捉装置２２をフード６の蒸気入口に設置し、Ｎ−１６捕捉装置２３を蒸気乾燥器４３の蒸気出口に設置する点にある。Ｎ−１６捕捉装置２２および２３は、Ｎ−１６捕捉材料を担持した多孔体よりなる。   As shown in FIG. 7, the steam dryer 43 of the third embodiment includes a hood 6, current plates 73 and 103, a fixed bar 9, and a corrugated plate 8 fixed by the fixed bar 9, and further includes N-16. Capture devices 22 and 23 are provided. One of the features of this embodiment is that the N-16 capturing device 22 is installed at the steam inlet of the hood 6 and the N-16 capturing device 23 is installed at the steam outlet of the steam dryer 43. The N-16 trapping devices 22 and 23 are made of a porous body carrying an N-16 trapping material.

気水分離器３を通過した蒸気は、Ｎ−１６捕捉装置２２を通ってフード６から整流板７３，波板８，整流板１０３を通過し、Ｎ−１６捕捉装置２３を通って原子炉圧力容器１の上方に放出される。蒸気がＮ−１６捕捉装置２２および２３を通過する際、蒸気中に含まれるＮ−１６が吸着，反応，触媒作用等により捕捉され、タービン系に移行するＮ−１６量が低減される。   The steam that has passed through the steam separator 3 passes through the N-16 trapping device 22, passes through the rectifying plate 73, the corrugated plate 8, and the rectifying plate 103 from the hood 6, and passes through the N-16 trapping device 23 and passes through the reactor pressure It is discharged above the container 1. When steam passes through the N-16 traps 22 and 23, N-16 contained in the steam is trapped by adsorption, reaction, catalysis, etc., and the amount of N-16 transferred to the turbine system is reduced.

Ｎ−１６捕捉装置２２および２３は、設置場所と圧力損失よりその厚さが規定される。   The thicknesses of the N-16 capturing devices 22 and 23 are determined by the installation location and pressure loss.

Ｎ−１６捕捉装置２２および２３は、実施例１および２と同様、蒸気に同伴するＮ−１６の化合物を吸着，反応，触媒分解などができる材料のうち１つ以上の材料より選定されたＮ−１６捕捉材料を、金属鋼材などで製造された多孔体に担持して製造する。構造的強度が確保できる場合は、Ｎ−１６捕捉材料で多孔体を形成し、Ｎ−１６捕捉装置とすることもできる。Ｎ−１６捕捉装置２２および２３で使用されるＮ−１６捕捉材料および多孔体の構成材料は、同じものを使用してもよいし、異なるものを使用してもよい。Ｎ−１６捕捉装置２２および２３は、その両方を設置してもよいし、いずれか一方のみを設置してもよい。   The N-16 trapping devices 22 and 23 are selected from one or more materials among materials capable of adsorbing, reacting, and catalytically decomposing N-16 compounds accompanying steam, as in Examples 1 and 2. A -16 trapping material is supported on a porous body made of metal steel or the like. When the structural strength can be ensured, a porous body can be formed from the N-16 trapping material to form an N-16 trapping device. The same or different materials may be used for the N-16 trapping material and the porous material used in the N-16 trapping devices 22 and 23. Both of the N-16 capturing devices 22 and 23 may be installed, or only one of them may be installed.

Ｎ−１６捕捉装置２２を蒸気入口に設置することで、蒸気乾燥器４３に流入する蒸気が整流され、整流板７３および波板８における液滴除去効果を向上することもできる。また、Ｎ−１６捕捉装置２３を蒸気出口に設置することで、原子炉圧力容器１の上方に放出される蒸気が整流され、蒸気が蒸気乾燥器４３から主蒸気ノズル５に移動する間の摩擦等による圧力損失を低減することもできる。   By installing the N-16 capturing device 22 at the steam inlet, the steam flowing into the steam dryer 43 is rectified, and the droplet removing effect on the rectifying plate 73 and the corrugated plate 8 can be improved. Further, by installing the N-16 trapping device 23 at the steam outlet, the steam discharged above the reactor pressure vessel 1 is rectified, and the friction while the steam moves from the steam dryer 43 to the main steam nozzle 5. It is also possible to reduce pressure loss due to the like.

本実施例の沸騰水型原子力プラントおよび蒸気乾燥器によれば、沸騰水型原子力プラントにおいて生成するＮ−１６を含む窒素化合物を、当該原子力プラントの原子炉圧力容器内に設置された蒸気乾燥器において捕捉することで、発電効率を維持しつつ、Ｎ−１６を含む窒素化合物を捕捉する能力を有する材料とＮ−１６を含む窒素化合物との接触効率が向上し、Ｎ−１６のタービン系への移行量を低減することができ、タービン系の線量率を低減することができる。   According to the boiling water nuclear plant and the steam dryer of the present embodiment, the steam dryer in which the nitrogen compound containing N-16 generated in the boiling water nuclear plant is installed in the reactor pressure vessel of the nuclear plant. By capturing at, the contact efficiency between the material having the ability to capture nitrogen compounds containing N-16 and the nitrogen compounds containing N-16 is improved while maintaining the power generation efficiency, and the N-16 turbine system is improved. Can be reduced, and the dose rate of the turbine system can be reduced.

さらに、本実施例によれば、Ｎ−１６の移行およびタービン系の線量を低減できるとともに、蒸気の整流効果により機器効率の向上を図ることができる。   Furthermore, according to the present embodiment, the transition of N-16 and the turbine system dose can be reduced, and the equipment efficiency can be improved by the rectification effect of steam.

１ 原子炉圧力容器
２ 炉心
３ 気水分離器
４，４２，４３ 蒸気乾燥器
５ 主蒸気ノズル
６ フード
７，１０，７２，７３，１０２，１０３ 整流板
８ 波板
９ 固定棒
１１ 蒸気乾燥器ユニット
１２，１３，２２，２３
Ｎ−１６ 捕捉装置 DESCRIPTION OF SYMBOLS 1 Reactor pressure vessel 2 Core 3 Steam-water separator 4, 42, 43 Steam dryer 5 Main steam nozzle 6 Hood 7, 10, 72, 73, 102, 103 Current plate 8 Corrugated plate 9 Fixed rod 11 Steam dryer unit 12, 13, 22, 23
N-16 capture device

Claims (10)

沸騰水型原子力プラントにおいて、
前記原子力プラントの原子炉圧力容器内に設置される蒸気乾燥器内の蒸気が通過する領域に、放射性窒素化合物であるＮ−１６を捕捉する材料を担持した多孔体を設置し、
前記多孔体は、前記蒸気の線速度が１ｍ／秒以下の領域に配置され、かつ前記蒸気乾燥器の波板の後段にある蒸気出口側の整流板又は前記蒸気出口側の整流板の後段に設置された放射性窒素捕捉装置であることを特徴とする沸騰水型原子力プラント。 In boiling water nuclear power plant,
A porous body carrying a material that captures N-16 , which is a radioactive nitrogen compound , is installed in a region through which steam in a steam dryer installed in a reactor pressure vessel of the nuclear power plant passes,
The porous body is disposed in a region where the linear velocity of the steam is 1 m / sec or less , and is located on the steam outlet side rectifying plate or the steam outlet side rectifying plate after the corrugated plate of the steam dryer. A boiling water nuclear power plant characterized by being an installed radioactive nitrogen capture device . 放射性窒素化合物を捕捉する材料を担持した前記多孔体が、前記蒸気乾燥器に備えられる蒸気入口側の整流板及び前記蒸気乾燥器の波板の後段にある前記蒸気出口側の整流板であることを特徴とする請求項１に記載の沸騰水型原子力プラント。 The porous body carrying a material that captures radioactive nitrogen compounds is a rectifying plate on the steam inlet side provided in the steam dryer and a rectifying plate on the steam outlet side subsequent to the corrugated plate of the steam dryer. The boiling water nuclear plant according to claim 1. 放射性窒素化合物を捕捉する材料を担持した前記多孔体で構成される放射性窒素捕捉装置を、前記蒸気乾燥器に設置された整流板の蒸気入口側および前記蒸気乾燥器の波板の後段にある前記蒸気出口側に設置することを特徴とする請求項１に記載の沸騰水型原子力プラント。 The radioactive nitrogen capture device composed of the porous body carrying the material for capturing the radioactive nitrogen compound is disposed on the steam inlet side of the rectifying plate installed in the steam dryer and at the rear stage of the corrugated plate of the steam dryer. The boiling water nuclear plant according to claim 1, wherein the boiling water nuclear plant is installed on a steam outlet side. 前記放射性窒素化合物を捕捉する物質は、
アンモニアおよび／または一酸化窒素を、吸着反応，化学反応，触媒作用の少なくとも一つの作用により前記放射性窒素化合物を捕捉する材料であることを特徴とする請求項１乃至３のいずれか１項に記載の沸騰水型原子力プラント。 The substance that captures the radioactive nitrogen compound is:
4. The material according to claim 1, wherein ammonia and / or nitrogen monoxide is a material that captures the radioactive nitrogen compound by at least one of an adsorption reaction, a chemical reaction, and a catalytic action. 5. Boiling water nuclear power plant. 前記多孔体は、
金属，金属酸化物，金属炭化物及び金属窒化物のうちの少なくとも一つで構成されることを特徴とする請求項１乃至４のいずれか１項記載の沸騰水型原子力プラント。 The porous body is
5. The boiling water nuclear plant according to claim 1, comprising at least one of a metal, a metal oxide, a metal carbide, and a metal nitride. 前記多孔体は、
放射性窒素化合物を捕捉する物質により構成されることを特徴とする請求項１乃至４のいずれか１項に記載の沸騰水型原子力プラント。 The porous body is
The boiling water nuclear power plant according to any one of claims 1 to 4, wherein the boiling water nuclear plant is composed of a substance that traps radioactive nitrogen compounds. 沸騰水型原子力プラントの原子炉圧力容器内に設置される蒸気乾燥器において、
前記蒸気乾燥器内の蒸気が通過する領域に、放射性窒素化合物であるＮ−１６を捕捉する材料を担持した多孔体を設置し、
前記多孔体は、前記蒸気の線速度が１ｍ／秒以下の領域に配置され、かつ前記蒸気乾燥器の波板の後段にある蒸気出口側の整流板又は前記蒸気出口側の整流板の後段に設置された放射性窒素捕捉装置であることを特徴とする沸騰水型原子力プラントの蒸気乾燥器。 In the steam dryer installed in the reactor pressure vessel of the boiling water nuclear plant,
A porous body carrying a material that captures N-16 , which is a radioactive nitrogen compound , is installed in a region through which steam in the steam dryer passes,
The porous body is disposed in a region where the linear velocity of the steam is 1 m / sec or less , and is located on the steam outlet side rectifying plate or the steam outlet side rectifying plate after the corrugated plate of the steam dryer. A steam dryer of a boiling water nuclear plant characterized by being an installed radioactive nitrogen capture device . 放射性窒素化合物を捕捉する材料を担持した前記多孔体が、前記蒸気乾燥器に備えられる蒸気入口側の整流板及び前記蒸気乾燥器の波板の後段にある前記蒸気出口側の整流板であることを特徴とする請求項７に記載の沸騰水型原子力プラントの蒸気乾燥器。 The porous body carrying a material that captures radioactive nitrogen compounds is a rectifying plate on the steam inlet side provided in the steam dryer and a rectifying plate on the steam outlet side subsequent to the corrugated plate of the steam dryer. A steam dryer for a boiling water nuclear plant according to claim 7. 放射性窒素化合物を捕捉する材料を担持した前記多孔体で構成される放射性窒素捕捉装置を、前記蒸気乾燥器に設置された整流板の蒸気入口側および前記蒸気乾燥器の波板の後段にある前記蒸気出口側に設置することを特徴とする請求項７に記載の沸騰水型原子力プラントの蒸気乾燥器。 The radioactive nitrogen capture device composed of the porous body carrying the material for capturing the radioactive nitrogen compound is disposed on the steam inlet side of the rectifying plate installed in the steam dryer and at the rear stage of the corrugated plate of the steam dryer. It installs in the steam outlet side, The steam dryer of the boiling water nuclear power plant of Claim 7 characterized by the above-mentioned. 前記多孔体は、
放射性窒素化合物を捕捉する物質により構成されることを特徴とする請求項７乃至９のいずれか１項に記載の沸騰水型原子力プラントの蒸気乾燥器。 The porous body is
The steam dryer for a boiling water nuclear plant according to any one of claims 7 to 9, wherein the steam dryer is constituted by a substance that traps radioactive nitrogen compounds.
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